Too big to fail?

The Roman Empire did not fall in a battle of war. There was no single big clash of arms that drove it to its knees. It was corroded from the inside. At one stage, the wealthy held so much gold coins that there was not enough currency to keep services to the public going. By keeping the money to themselves the wealthy had simply run the empire into the ground.

History is strewn with such examples. Has this now happened to the United States? Or is the US too big to fail?